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    SubjectRe: Massive TCPv4 bad checksum
    On Sun, 18 Oct 1998, H.J. Lu wrote:
    > > Geert Uytterhoeven <geert@geert.cs.kuleuven.ac.be> writes:
    > > > On Sat, 17 Oct 1998, H.J. Lu wrote:
    > > >> I have massive TCPv4 bad checksum on my CSLIP link from
    > > >> my CSLIP server to my machine ever since I upgraded to
    > > >> linux 2.1.1xx. Any suggestions?
    > >
    > > > My m68k box generates plenty of these messages when receiving packets from my
    > > > PPC box. This would indicate a bug in the checksum code for either (or both)
    > > > m68k and PPC.
    > >
    > > > But I also see the message on my AXP box, when receiving packets from the PPC.
    > > > The Intel box on our network reports no bad checksums at all. None of the
    > > > Linux boxes report any bad checksums from the Winslows machines.
    > >
    > > > Who's (who are?) the bad guy(s)?
    > >
    > > Is there a systematic on what types of packets arrive with bad checksums?
    > >
    >
    > Most of the bad packets are from ftp and rsh. As the result, my
    > ftp and CVS over rsh on my CSLIP link are much slower than 2.0.

    Mine come mostly from ssh, and some from auth:

    TCPv4 bad checksum from 10.0.24.8:03ff to 10.0.24.15:0016, len=20/20/40
    TCPv4 bad checksum from 10.0.24.8:03ff to 10.0.24.4:0016, len=20/20/40
    TCPv4 bad checksum from 10.0.24.8:0071 to 10.0.24.4:04e2, len=20/20/40

    10.0.24.4 = m68k
    10.0.24.8 = PPC
    10.0.24.15 = AXP

    Greetings,

    Geert

    --
    Geert Uytterhoeven Geert.Uytterhoeven@cs.kuleuven.ac.be
    Wavelets, Linux/{m68k~Amiga,PPC~CHRP} http://www.cs.kuleuven.ac.be/~geert/
    Department of Computer Science -- Katholieke Universiteit Leuven -- Belgium


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